import React, { Component } from 'react';
import { connect } from 'react-redux';
import isEmpty from 'lodash/isEmpty';
import { TransitionGroup, CSSTransition } from 'react-transition-group';
import {
  setWallet,
  TSetWallet,
  unlockKeystore,
  TUnlockKeystore,
  unlockMnemonic,
  TUnlockMnemonic,
  unlockPrivateKey,
  TUnlockPrivateKey,
  unlockWeb3,
  TUnlockWeb3,
  resetWallet,
  TResetWallet
} from 'actions/wallet';
import { reset, TReset } from 'actions/transaction';
import translate from 'translations';
import {
  DigitalBitboxDecrypt,
  KeystoreDecrypt,
  LedgerNanoSDecrypt,
  MnemonicDecrypt,
  PrivateKeyDecrypt,
  PrivateKeyValue,
  TrezorDecrypt,
  ViewOnlyDecrypt,
  Web3Decrypt,
  NavigationPrompt,
  WalletButton
} from './components';
import { AppState } from 'reducers';
import { knowledgeBaseURL } from 'config/data';
import { IWallet } from 'libs/wallet';
import DigitalBitboxIcon from 'assets/images/wallets/digital-bitbox.svg';
import LedgerIcon from 'assets/images/wallets/ledger.svg';
import MetamaskIcon from 'assets/images/wallets/metamask.svg';
import MistIcon from 'assets/images/wallets/mist.svg';
import TrezorIcon from 'assets/images/wallets/trezor.svg';
import './WalletDecrypt.scss';

type UnlockParams = {} | PrivateKeyValue;

interface Props {
  resetTransactionState: TReset;
  unlockKeystore: TUnlockKeystore;
  unlockMnemonic: TUnlockMnemonic;
  unlockPrivateKey: TUnlockPrivateKey;
  setWallet: TSetWallet;
  unlockWeb3: TUnlockWeb3;
  resetWallet: TResetWallet;
  wallet: IWallet;
  hidden?: boolean;
  offline: boolean;
  disabledWallets?: string[];
}

interface State {
  selectedWalletKey: string | null;
  value: UnlockParams | null;
}

interface BaseWalletInfo {
  lid: string;
  component: any;
  initialParams: object;
  unlock: any;
  helpLink?: string;
  isReadOnly?: boolean;
  attemptUnlock?: boolean;
}

export interface SecureWalletInfo extends BaseWalletInfo {
  icon?: string | null;
  description: string;
}

export interface InsecureWalletInfo extends BaseWalletInfo {
  example: string;
}

const WEB3_TYPES = {
  MetamaskInpageProvider: {
    lid: 'x_MetaMask',
    icon: MetamaskIcon
  },
  EthereumProvider: {
    lid: 'x_Mist',
    icon: MistIcon
  }
};
const WEB3_TYPE: string | false =
  (window as any).web3 && (window as any).web3.currentProvider.constructor.name;

const SECURE_WALLETS = ['web3', 'ledger-nano-s', 'trezor', 'digital-bitbox'];
const INSECURE_WALLETS = ['private-key', 'keystore-file', 'mnemonic-phrase'];

export class WalletDecrypt extends Component<Props, State> {
  public WALLETS: { [key: string]: SecureWalletInfo | InsecureWalletInfo } = {
    web3: {
      lid: WEB3_TYPE ? WEB3_TYPES[WEB3_TYPE].lid : 'x_Web3',
      icon: WEB3_TYPE && WEB3_TYPES[WEB3_TYPE].icon,
      description: 'ADD_Web3Desc',
      component: Web3Decrypt,
      initialParams: {},
      unlock: this.props.unlockWeb3,
      attemptUnlock: true,
      helpLink: `${knowledgeBaseURL}/migration/moving-from-private-key-to-metamask`
    },
    'ledger-nano-s': {
      lid: 'x_Ledger',
      icon: LedgerIcon,
      description: 'ADD_HardwareDesc',
      component: LedgerNanoSDecrypt,
      initialParams: {},
      unlock: this.props.setWallet,
      helpLink:
        'https://ledger.zendesk.com/hc/en-us/articles/115005200009-How-to-use-MyEtherWallet-with-Ledger'
    },
    trezor: {
      lid: 'x_Trezor',
      icon: TrezorIcon,
      description: 'ADD_HardwareDesc',
      component: TrezorDecrypt,
      initialParams: {},
      unlock: this.props.setWallet,
      helpLink: 'https://doc.satoshilabs.com/trezor-apps/mew.html'
    },
    'digital-bitbox': {
      lid: 'x_DigitalBitbox',
      icon: DigitalBitboxIcon,
      description: 'ADD_HardwareDesc',
      component: DigitalBitboxDecrypt,
      initialParams: {},
      unlock: this.props.setWallet,
      helpLink: 'https://digitalbitbox.com/ethereum'
    },
    'keystore-file': {
      lid: 'x_Keystore2',
      example: 'UTC--2017-12-15T17-35-22.547Z--6be6e49e82425a5aa56396db03512f2cc10e95e8',
      component: KeystoreDecrypt,
      initialParams: {
        file: '',
        password: ''
      },
      unlock: this.props.unlockKeystore,
      helpLink: `${knowledgeBaseURL}/private-keys-passwords/difference-beween-private-key-and-keystore-file.html`
    },
    'mnemonic-phrase': {
      lid: 'x_Mnemonic',
      example: 'brain surround have swap horror cheese file distinct',
      component: MnemonicDecrypt,
      initialParams: {},
      unlock: this.props.unlockMnemonic,
      helpLink: `${knowledgeBaseURL}/private-keys-passwords/difference-beween-private-key-and-keystore-file.html`
    },
    'private-key': {
      lid: 'x_PrivKey2',
      example: 'f1d0e0789c6d40f399ca90cc674b7858de4c719e0d5752a60d5d2f6baa45d4c9',
      component: PrivateKeyDecrypt,
      initialParams: {
        key: '',
        password: ''
      },
      unlock: this.props.unlockPrivateKey,
      helpLink: `${knowledgeBaseURL}/private-keys-passwords/difference-beween-private-key-and-keystore-file.html`
    },
    'view-only': {
      lid: 'View Address',
      example: '0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8',
      component: ViewOnlyDecrypt,
      initialParams: {},
      unlock: this.props.setWallet,
      helpLink: '',
      isReadOnly: true
    }
  };
  public state: State = {
    selectedWalletKey: null,
    value: null
  };

  public componentWillReceiveProps(nextProps) {
    // Reset state when unlock is hidden / revealed
    if (nextProps.hidden !== this.props.hidden) {
      this.setState({
        value: null,
        selectedWalletKey: null
      });
    }
  }

  public getSelectedWallet() {
    const { selectedWalletKey } = this.state;
    if (!selectedWalletKey) {
      return null;
    }

    return this.WALLETS[selectedWalletKey];
  }

  public getDecryptionComponent() {
    const selectedWallet = this.getSelectedWallet();
    if (!selectedWallet) {
      return null;
    }

    return (
      <selectedWallet.component
        value={this.state.value}
        onChange={this.onChange}
        onUnlock={this.onUnlock}
      />
    );
  }

  public isOnlineRequiredWalletAndOffline(selectedWalletKey) {
    const onlineRequiredWallets = ['trezor', 'ledger-nano-s'];
    return this.props.offline && onlineRequiredWallets.includes(selectedWalletKey);
  }

  public buildWalletOptions() {
    const viewOnly = this.WALLETS['view-only'] as InsecureWalletInfo;

    return (
      <div className="WalletDecrypt-wallets">
        <h2 className="WalletDecrypt-wallets-title">{translate('decrypt_Access')}</h2>

        <div className="WalletDecrypt-wallets-row">
          {SECURE_WALLETS.map(type => {
            const wallet = this.WALLETS[type] as SecureWalletInfo;
            return (
              <WalletButton
                key={type}
                name={translate(wallet.lid)}
                description={translate(wallet.description)}
                icon={wallet.icon}
                helpLink={wallet.helpLink}
                walletType={type}
                isSecure={true}
                isDisabled={this.isWalletDisabled(type)}
                onClick={this.handleWalletChoice}
              />
            );
          })}
        </div>
        <div className="WalletDecrypt-wallets-row">
          {INSECURE_WALLETS.map(type => {
            const wallet = this.WALLETS[type] as InsecureWalletInfo;
            return (
              <WalletButton
                key={type}
                name={translate(wallet.lid)}
                example={wallet.example}
                helpLink={wallet.helpLink}
                walletType={type}
                isSecure={false}
                isDisabled={this.isWalletDisabled(type)}
                onClick={this.handleWalletChoice}
              />
            );
          })}

          <WalletButton
            key="view-only"
            name={translate(viewOnly.lid)}
            example={viewOnly.example}
            helpLink={viewOnly.helpLink}
            walletType="view-only"
            isReadOnly={true}
            isDisabled={this.isWalletDisabled('view-only')}
            onClick={this.handleWalletChoice}
          />
        </div>
      </div>
    );
  }

  public handleWalletChoice = (walletType: string) => {
    const wallet = this.WALLETS[walletType];
    if (!wallet) {
      return;
    }

    let timeout = 0;

    if (wallet.attemptUnlock) {
      timeout = 250;
      wallet.unlock();
    }

    setTimeout(() => {
      this.setState({
        selectedWalletKey: walletType,
        value: wallet.initialParams
      });
    }, timeout);
  };

  public clearWalletChoice = () => {
    this.setState({
      selectedWalletKey: null,
      value: null
    });
  };

  public render() {
    const { wallet, hidden } = this.props;
    const selectedWallet = this.getSelectedWallet();
    const decryptionComponent = this.getDecryptionComponent();
    const unlocked = !!wallet;
    return (
      <div>
        <NavigationPrompt when={unlocked} onConfirm={this.props.resetWallet} />
        {!hidden && (
          <article className="Tab-content-pane">
            <div className="WalletDecrypt">
              <TransitionGroup>
                {decryptionComponent && selectedWallet ? (
                  <CSSTransition classNames="DecryptContent" timeout={500} key="decrypt">
                    <div className="WalletDecrypt-decrypt">
                      <button
                        className="WalletDecrypt-decrypt-back"
                        onClick={this.clearWalletChoice}
                      >
                        <i className="fa fa-arrow-left" /> {translate('Change Wallet')}
                      </button>
                      <h2 className="WalletDecrypt-decrypt-title">
                        {!selectedWallet.isReadOnly && 'Unlock your'}{' '}
                        {translate(selectedWallet.lid)}
                      </h2>
                      <section className="WalletDecrypt-decrypt-form">
                        {decryptionComponent}
                      </section>
                    </div>
                  </CSSTransition>
                ) : (
                  <CSSTransition classNames="DecryptContent" timeout={500} key="wallets">
                    {this.buildWalletOptions()}
                  </CSSTransition>
                )}
              </TransitionGroup>
            </div>
          </article>
        )}
      </div>
    );
  }

  public onChange = (value: UnlockParams) => {
    this.setState({ value });
  };

  public onUnlock = (payload: any) => {
    const { value, selectedWalletKey } = this.state;
    if (!selectedWalletKey) {
      return;
    }

    // some components (TrezorDecrypt) don't take an onChange prop, and thus
    // this.state.value will remain unpopulated. in this case, we can expect
    // the payload to contain the unlocked wallet info.
    const unlockValue = value && !isEmpty(value) ? value : payload;
    this.WALLETS[selectedWalletKey].unlock(unlockValue);
    this.props.resetTransactionState();
  };

  private isWalletDisabled = (walletKey: string) => {
    if (!this.props.disabledWallets) {
      return false;
    }
    return this.props.disabledWallets.indexOf(walletKey) !== -1;
  };
}

function mapStateToProps(state: AppState) {
  return {
    offline: state.config.offline,
    wallet: state.wallet.inst
  };
}

export default connect(mapStateToProps, {
  unlockKeystore,
  unlockMnemonic,
  unlockPrivateKey,
  unlockWeb3,
  setWallet,
  resetWallet,
  resetTransactionState: reset
})(WalletDecrypt);